import java.io.FileWriter;
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import java.io.IOException;
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import java.sql.*;
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import java.util.ArrayList;
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import java.util.List;
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/**
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* 独立的数据库表结构导出工具
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*/
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public class DatabaseSchemaExporter {
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private static final String URL = "jdbc:mysql://139.155.104.10:3306/ryc?useUnicode=true&characterEncoding=utf8&useSSL=false&serverTimezone=Asia/Shanghai";
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private static final String USERNAME = "ryc";
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private static final String PASSWORD = "KiYap3E8X8RLcM6T";
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private static final String DATABASE_NAME = "ryc";
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public static void main(String[] args) {
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new DatabaseSchemaExporter().exportDatabaseSchema();
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}
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public void exportDatabaseSchema() {
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System.out.println("🔄 开始导出数据库表结构...");
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try {
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// 加载MySQL驱动
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Class.forName("com.mysql.cj.jdbc.Driver");
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try (Connection conn = DriverManager.getConnection(URL, USERNAME, PASSWORD)) {
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StringBuilder sqlBuilder = new StringBuilder();
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sqlBuilder.append("-- Database schema dump for ryc\n");
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sqlBuilder.append("-- Generated at: ").append(new java.util.Date()).append("\n\n");
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// 获取所有表名
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List<String> tableNames = getAllTableNames(conn);
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for (String tableName : tableNames) {
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System.out.println("📋 导出表: " + tableName);
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String createTableSql = getCreateTableStatement(conn, tableName);
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sqlBuilder.append(createTableSql).append("\n\n");
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}
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// 写入文件
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String outputPath = "db_actual.sql";
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try (FileWriter writer = new FileWriter(outputPath)) {
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writer.write(sqlBuilder.toString());
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}
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System.out.println("✅ 数据库表结构导出完成: " + outputPath);
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// 特别检查t_employee表的结构
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checkEmployeeTableStructure(conn);
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}
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} catch (Exception e) {
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System.err.println("❌ 导出数据库表结构失败: " + e.getMessage());
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e.printStackTrace();
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}
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}
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private List<String> getAllTableNames(Connection conn) throws SQLException {
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List<String> tableNames = new ArrayList<>();
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DatabaseMetaData metaData = conn.getMetaData();
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try (ResultSet tables = metaData.getTables(DATABASE_NAME, null, "%", new String[]{"TABLE"})) {
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while (tables.next()) {
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String tableName = tables.getString("TABLE_NAME");
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if (tableName.startsWith("t_")) { // 只导出业务表
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tableNames.add(tableName);
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}
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}
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}
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return tableNames;
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}
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private String getCreateTableStatement(Connection conn, String tableName) throws SQLException {
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try (Statement stmt = conn.createStatement();
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ResultSet rs = stmt.executeQuery("SHOW CREATE TABLE " + tableName)) {
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if (rs.next()) {
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String createSql = rs.getString(2);
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return "-- Table: " + tableName + "\n" + createSql + ";";
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}
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}
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return "";
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}
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private void checkEmployeeTableStructure(Connection conn) throws SQLException {
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System.out.println("\n🔍 检查t_employee表结构:");
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DatabaseMetaData metaData = conn.getMetaData();
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try (ResultSet columns = metaData.getColumns(DATABASE_NAME, null, "t_employee", null)) {
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while (columns.next()) {
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String columnName = columns.getString("COLUMN_NAME");
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String dataType = columns.getString("TYPE_NAME");
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int columnSize = columns.getInt("COLUMN_SIZE");
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String isNullable = columns.getString("IS_NULLABLE");
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String defaultValue = columns.getString("COLUMN_DEF");
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System.out.printf(" 📝 %s: %s(%d) %s %s%n",
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columnName,
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dataType,
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columnSize,
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"YES".equals(isNullable) ? "NULL" : "NOT NULL",
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defaultValue != null ? "DEFAULT " + defaultValue : ""
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);
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}
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}
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}
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}
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